@article {Cossar:2005-03-01T00:00:00:0003-7028:300,
author = "Cossar, Marlee and Teh, Joo and Kivisto, Annikki and Mackenzie, Jason",
title = "Determination of the Percentage of Homopolymer Component in Ziegler/Natta Catalyst Linear Low-Density Polyethylene Resins Using High-Temperature Cell Fourier Transform Infrared and Partial Least Squares Quantitative Analysis Technique",
journal = "Applied Spectroscopy",
volume = "59",
number = "3",
year = "2005-03-01T00:00:00",
abstract = "A new method for the determination of the percentage of homopolymer component, using high-temperature cell Fourier transform infrared (FT-IR) by partial least squares (PLS) quantitative analysis technique, was developed and applied to Ziegler Natta linear low-density polyethylene (LLDPE).
The method is based on the IR spectrum changes between the 730 cm^{−1} band and 720 cm^{−1} band at the temperature of 110 °C, which is near the melting point of the polyethylene. The HD% (the percentage of high-density component, i.e., the percentage of homopolymer
component) results obtained by CTREF (CRYSTAF in TREF mode) technique are used as the input data together with the respective FT-IR spectra for PLS analyses to establish a calibration curve. The PLS quality is characterized by a correlation coefficient of 0.997 (cross-validation) using four
factors and a root mean square error of calibration (RMSEC) of 0.772. The HD% of the unknown can then be predicted by the PLS software from the unknown FT-IR spectrum. A control resin was tested seven times by CTREF and FT-IR. The HD% of the control resin was 28.59 ± 0.88% by CTREF
and 29.05 ± 2.37% by FT-IR. It was found that the method was applicable for the same comonomer type of LLDPE within a melt index range and density.",
pages = "300-304",
url = "http://www.ingentaconnect.com/content/sas/sas/2005/00000059/00000003/art00006",
doi = "doi:10.1366/0003702053585435",
keyword = "TREF, ZN-LLDPE, LINEAR LOW-DENSITY POLYETHYLENE, HIGH-TEMPERATURE CELL, PLS, FOURIER TRANSFORM INFRARED SPECTROSCOPY, HIGH-DENSITY COMPONENT, HOMOPOLYMER COMPONENT, FT-IR SPECTROSCOPY, PARTIAL LEAST SQUARES"
}